While updating a page of my website I've seen some rendering errors in my table, which makes a lot of use of rowspan. I've made a minimal testcase.
It seems that if two collections of rows with rowspan enabled follow each other, the second collection will have the bottom border of the first row displayed regardless. This only happens if the second collection is followed by at least another row.
In the initial document, I've seen the display bug on a third collection following the sole row after the second collection, but I wasn't able to reproduce this in my testcase.
This bug is not present in Firefox.